Information for Strong-Motion Station
Oakland - SF Bay Bridge/East: YBITS
CGS - CSMIP Station 58602
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.8126 N
Longitude 122.3627 W
Elevation (m) 16
Site Geology Shallow alluvium/fill over rock (sedimentary)
Vs30 (m/sec) - -
Site Class
Remarks/Notes Site information sources
No. of Spans9
Plan ShapeCurved
Total Length461.3m (west bound); 448.8m (east bound)
Width of Deck27.161m(west bound); 27.169m plus 5.8m bikepath (east bound)
Construction Date2013
Instrumentation2014. 23 accelerometers and 2 relative displacement sensors on the bridge plus 3 accelerometers at a reference free-field site (CSMIP sta. 58605).
Superstructure TypeCast-in-place concrete box girders supported by concrete columns. The superstructure is divided into 2 frames with hinges. The first frame consists of four spans on 2-column outrigger bents (WB) or 1-column bents (EB). The second frame is supported on elongated single column bents.
Substructure TypeConcrete columns. 1 or 2 columns per bent. Maximum column height is 51 m at Bent W4.
Foundation TypeConcrete pile caps with CIDH concrete piles or steel piles in groups. Pile tip elevation ranges from -18m to 32m. At Bents W3 and W4L, the pile caps are anchored to rock with tiedowns.
RemarksThe new East Span opened to traffic on September 2, 2013. The Yerba Buena Island Transition Structure (YBITS) was instrumented during construction under the interagency agreement between Caltrans and DOC.